books.google.com - For more than two centuries, amateur astronomers have earned their stripes by observing the 109 star clusters, nebulae, and galaxies cataloged by French comet hunter Charles Messier. Sir Patrick Moore has compiled a new list of 109 deep-sky delights, the Caldwell Catalog, which covers the entire celestial...http://books.google.com/books/about/The_Caldwell_objects.html?id=3Hg6YHgx9nAC&utm_source=gb-gplus-shareThe Caldwell objects
